Machine for forming rotary cutters



A. JENNINGS. MAKING GUTTERSFOR GEAR CUTTING ENGINES.

No 7,219. Patented Mar. 26, 1850.

when STATES? ATENT OFFICE.

ANDREW JENNINGS, OF FALIi RIVER, MASSACHUSETTS.

MACHINE FOR FORMING ROTARY CUTTERS.

Specification of Letters Patent No. 7,219, dated March 26, 1850.

To all whom it may concern Be it known that I, ANDREW JENNINGS, of Fall River, in the county of Bristol and State of Massachusetts, have invented a new and Improved Machine for Making Cutters for Gear-Cutting Engines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the annexed drawings making a part of this specification, in which similar letters refer to like parts in all the figures.

Fig. I is a perspective of one end of my machine. Fig. II is a perspective of the reverse of my machine. Fig. III is a section through the cutting parts showing their angle &c.

My invention consists mainly in an improved method of making the cutter, or tool, for a gear cutting engine; and I use a head having two steel cutters so placed and operated, as to be susceptible of a greater degree of nice adjustment, and consequently am capable of producing a more perfectly formed tool for cutting gear, than any method hitherto in use.

The construction of my head is as follows-On a suitable bed (a) I place near one end, and perpendicular to it, a standard (a), on a pin (a) at the top of which, the tool to beshaped, is to be placed or held. A plate (5) is made to slide longitudinally on the bed (a), and is confined within guides (b, b). This plate has an upright piece at each side (0, 0,.) which sustain the moving parts of the machine. On the inner side of each of these uprights, a plate is attached (d) which is confined to the upright by a bolt ({(Z') passing through it, and work ing in a slot (0) in the upright; a nut (61) on this bolt secures the plate at any desired height. A thumb-screw (6) working through the top of the upright and into the shaft of the bolt (01) is used for more readily adjusting the plate to a proper position.

The inner side of each of the plates (d) has on it a circular piece or disk (f); the bolt (d) passes. through the center of this disk, and the head of it (not seen in the drawing by reason of intervening parts,) confines the disk to the plate. Across the inner face of each disk, either made solid with it, or firmly fixed to it, is a box (g), projecting far.: enough to bring a shaft (h) which revolves in each of these boxes, into the same perpendicular plane, which plane also passes through the center of the standard. (a). On the end of each shaft (h, h,) nearest to the standard is fixed a wheel (71) which is the cutting instrument. It is of tempered steel, and the cutting parts are arranged across the edge of it to which such shape is given as will produce in reverse the desired angle or epicycloidal curve when brought into contact with the face of the tool to be formed, and which angle or curve will be directly represented on the sides of teeth made by cutters prepared by my method.

On the opposite ends of each shaft (71., h,) is a bevel wheel (70, 7a,) which gears into another (Z) placed at right angles with its axis. The shaft (1) of the bevel wheel (Z) revolves in a box (m) firmly fixed on the edge of the disk (f) in such position that the shafts (Z', Z,) shall be parallel to the axes of the disks On the end of each of these shafts opposite to the bevel Wheels (Z,) is a pulley (n) over which passes the cord or band conveyin the motion by which the operation is e ected. A scale is laid off on the edge'of the disk (p) in order to determine more accurately the relative angle given to the steel cutters, which angle is given by turning each disk, and of course the parts fixed to it, around its center which is the bolt (6K). The operation of my in vention will be thus The tool or cutter (r to be shaped,'is placed on the pin (CZ-I; forming the prolongation of the standard (a') which is of a size corresponding to the hole in the cutter By raising or lowerings the plates (d, d,) and turning the disks f,) on their centers, the steel cutters (2', 6,) are brought with their respective axes at such an angle with, and their cutting edges at such a distance from, each other, as will reduce the tool (1'), when it comes be tween them, to the required form. Motion is then given by cords or bands to the pulleys (n, 01,) which motion is transmitted by the intermediate shafts and bevel wheels to the steel cutters (2', i,) causing them to revolve in opposite directions.

The sliding plate (6), to which is attached the moving parts of my machine, is moved up toward the standard (a) by a lever (s), or by equivalent mechanical means, until the steel cutters (i, t',) are, the one 'above, and the other below, the edge of the tool (1"), when the work of properly shaping it commences. The steel cutters are attached the boxes in which the cutter- 5 shafts revolve; the disks being capable by means of vibratory motion on their axes, of adjusting the cutter-shafts to any required angle with the horizon, and the whole machine being for the purpose of shaping at 20 the same time both faces of a revolving cutter, substantially as herein described.

ANDREW JENNINGS.

Witnesses:

NATHAN D. DEAN, ADMIRAL I. WARREN, DAVID TOWLE. 

